All Day is the fifth studio album by American musician Gregg Gillis, known by his stage name Girl Talk. The album was originally released as a free digital download by Illegal Art on November 15, 2010. Gillis composed the album using overlapping samples of 372 songs by other artists.[1]All Day was released as one seamless 71-minute file and as 12 separate tracks, available in MP3 and FLAC.[2] As with prior Girl Talk albums, the Illegal Art website states that All Day was "intended to be listened to as a whole," but was "broken up into individual tracks only for easier navigation."[3]

Illegal Art later published a complete list of samples used on the album on their website.[4] Other sources have created time listings[5] to assist in studying the music.[6] The album, segmented into twelve "episodes", is used as the soundtrack to the 2011 feature-length Jacob Krupnick dance video, "Girl Walk//All Day".[7]

All Day was well received by most music critics upon its release. On the review aggregate site Metacritic, the album has a score of 79 out of 100, indicating "Generally positive reviews."[8]

The samples in the album were described as "instantly recognizable hooks".[19] Reviewers frequently praised the innovation of the music style, saying that it is "like nothing you've ever heard",[20] "[rehabilitation for] disposable pop",[21] among those "tricks [that] just don’t get old",[22] with appeal "first for the sampled songs themselves, [and] second for the thrill of the novelty of early mash-ups",[12] and that "the entire mega-mash-up is stupendously danceable".[11]